Shrouding for turbine-buckets.



F. R. (L BOYD. SHROUDING FOR TURBINE BUUKETS.

,- APPLIUATIGN FILED AUG. 13, 1907.

903,167.` Patented Nov. 10, 1908.

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FREDERIC R. C. BOYD, OF LYNN7 MASSACHUSETTS, ASSIGNORTO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

A sHRoUDING Fon TURBINEBUCKETS.

To all whom it may concer/n.:

Be it known that I, FREDERIC R. C. BOYD, a citizen of the United States, residing at Lynn,l county of Essex, State of Massachusetts, have invented certain new anduseful Improvements in Shrouding for Turbine-Buckets, of which the following is a specification. i

This invention relates to elastic fluid turbines, and its object is to rovide anv improved shroud ring `for the tips ofthe blades or buckets. A well-known form of shrouding is madel in the form of a channel iron Awhose web receives the tenons on the ends ofthe buckets, while the flanges of said channel extend toward the oppositemember .of

.the turbine; the shrouding being applied to th`e buckets on the stator as well as on.the. rotor of the machine. of the iianges lie close tothe opposite member, so that they quite effectively baffle the leakage of steam past the ends ofthe buckets. It is found, however-,that the water of condensation, also,fis prevented 'from passing the buckets, and accumulates in the spaces between the flanges of the shroud rings,

where it exerts a brake action sufiicient to seriously impair the eiiciencyof the turbine.l My invention aims to obviate this dini-- culty, and'to this end it consists in a shroud ring or baiiier containingports or passageways through which the water can pass.

Since there will also be a leakage of steam 1 at these points, the adjacent buckets are preferably made longer so that the leaking steam In the accompanying drawing, Figure 1 is an edge view of a number of v'buckets equipped with my improved shroud ring; Fig. 2 is a-plan view of the same; Fig. 3

is a side view of four buckets; Fig. 4 is av perspective view showing the escape port; and Figs. 5 and' 6 are perspective views of modifications.

The buckets 1 a-re of the usual construe-i` tion, and are secured in alternate rows7 in any suitable manner, to the two members of the turbine, the rotor 2 and the stator 3, respectively. The shroud ring or baiiler is made preferably in sections. It has a web 4, in which the tenons 5 of the buckets are riveted, and a flange 6 at ri ht angles to the web, whose periphery stan s close to the specification of Letters Patent.

Application filed August 13, 1907. Serial No. 388,350.

In each case the edges patent statutes,

Patented Nov. io, ioos.

' opposite member of the turbine. In Figs.

1,2 and 3 the ends of the sections arel sepa- 4rated by a space equal to that between two buckets and the buckets lEt .at the ends Vof each section are longer than the others, ex-

tending beyond the web 4 and 'terminating' substantially flush with the periphery of the 60 iange 6. The web 4 abuts against these end buckets, and is provided with a tenon 7 which passes through said buckets and is riveted down thereon, as shown in Fig. l. It will be seen that the space between two adjacent end buckets l is not obstructed by any web or ange, so that both steam and water can pass through and will not be trapped by the shroud ring. Owing to the extension of the end buckets, the steam passing through will exert its usual reactionary effect on the portion of said buckets beyond the web 4.

Fig. '5 shows a modified structure in which the shroud ring is continuous, or composed of abutting sections; but at intervals the flange 6 is cut away,

ports for the water. Fig@ shows a channel iron baffler similarly provided with escape' ring there can be no trapping of water in the.

shrouding; and whether one or tivo ianges are used, the escape ports, due to the non-VV continuity of said flanges, prevent the trapping of water betweenthe-buckets. vention therefore obviates the trouble due to the brake action of entrapped water, and to, this extent improves the operation' of the turbine. i

I have illustrated the invention as applied to baiilers which operate at the ends of the buckets, that is, inthe same plane of revolution. But it is evident that the invention is also applicable to bafilers which operato at the'side of the row of buckets, and this modification is so obvious that it has not been deemed necessary to do more than merely call attention to it.

In accordance with the provisions of the I have described the principle of operation of my invention, together with the apparatus which Ifnow consider to represent the best embodiment thereof; but I desire to have it understood that the as at S, to afford escape The inapparatus shown is only filinstratime, and that'the invention can be carried* out by 'other means. f v What I claim sneW and desire to secure by ALetters Patentpf the United' Statesfisfe y 1.,;The combination ',withja'row of buckets f 'ofzan elastic viuid turbine,of a baiiier having means vformed therein for permittingWater Qf,. condensationto escape past said baier.

f2., VThe cornbinationfWith a row obuckets ofan elasticiuid turbine, of -a'bafer lhaving a -filange'- which is non-continuous, 4thereby providing portsor the escape otw'ater of condensation.

, v 3, The combination With'a row-of buckets of an elastic 'fluidy turbine, of a baer .made

" in sections 41which termi-nate [at adjacent buckets, vthereby leaving an. escape port b e'-,l

tween said buckets.

j 4. The combination with a row, of buckets lof anelasticviuid turbine, ofwabaier" made v in sections Whose ends abut against adj acentl "'buckets. f l

' 5.J'The combination with a'row of buckets i 6; The combination-witha rowf ofbuckets of lan elastic iuid turbine, of abaiiier ymade j -insectionsiterminating at adjacent buckets,

f said end buckets extending beyond the others to form a passageway for theescape -ofthe 'Water o condensationj 7. The combination with the edge'of saidv flange.

8."Thecomb1nat1on Withle4 rowl'ofbuckets fof 'an elastic fluid turbine, of a baiier con.- f v sisting of sections, each having a Web and a I fiangef the end' buckets being extended so that vtheir ends are" substantially iush with thejedge' of said-ange, the ends Aoffthewveb 'abutting against said ,end 'buckets hailing tenons passing through saidbuckets'. i"

In Witness whereof, I have hereunto my hand this ninthv dayof August, 1907.

a rowof buckets v of an elastic iuidturbine, of' a' -baHer con- "sisting'of sections,"each1having a web 4and a iange, the `end bucketsbeing extended so "that 'their ends are substantially flush' with yViitnesse-s:f

JOHN A. MCMANUS, Jr., T WILLiAM E. HANN'U-M.'

' of an elastic iuid turbine, cfa baiiier made" sections, the buckets ,at the ends of each'- I f section' being longerthan the others. 

